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KMID : 1120220220130050377
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Osong Public Health and Research Perspectives
2022 Volume.13 No. 5 p.377 ~ p.381
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Presumed population immunity to SARS-CoV-2 in South Korea, April 2022
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Jang Eun-Jung
Choe Young-June
Choe Seung-Ah
Kim Yoo-Yeon
Kim Ryu-Kyung
Kim Ji-A
Lim Do-Sang
Lee Ju-Hee
Yi Seon-Ju
Lee Sang-Won
Park Young-Joon
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Abstract
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Objectives: We estimated the overall and age-specific percentages of the Korean population with presumed immunity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) as of April 2022 using the national registry.
Methods: We used the national coronavirus disease 2019 (COVID-19) infection and vaccination registry from South Korea, as described to define individuals with a previous history of COVID-19 infection, vaccination, or both, as persons with presumed immunity.
Results: Of a total of 53,304,627 observed persons, 24.4% had vaccination and infection, 58.1% had vaccination and no infection, 7.6% had infection and vaccination, and 9.9% had no immunity,. The SARS-CoV-2 Omicron variant emerged at a time when the presumed population immunity ranged from 80% to 85%; however, nearly half of the children were presumed to have no immunity.
Conclusion: We report a gap in population immunity, with lower presumed protection in children than in adults. The approach presented in this work can provide valuable informed tools to assist vaccine policy-making at a national level.
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KEYWORD
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COVID-19, Immunity, Population, SARS-CoV-2, Vaccines
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